Twyer-cap.



K. LANDGRBBE.

TWYER GAP. v

APPLICATION FILED sBPT.z9. 1914.

Patented Mar. 2, 1915 22 V 1x l aww/Mo@ TWYER-CAP.

Specification of Letters Patent. l

Patented Mar. 2,1915. l

appucation filed september 29, 1914. serial No. 864,185'.

To all whom 'it may concern:

Be it known that I, KARL LANDGREBE, a

' citizen of the United States of lAmerica, re-

siding at Ensley, in the county of Jefferson and State of Alabama, have invented certain new and useful Improvements in Twyer-Caps, of which the following is a specification. y

My invention relates to twyer caps for blast furnaces and like devices. Heretofore, such caps have been provided with a single centrally disposed hole over which a plug of various designis fitted and in this plug is fitted a glass through which the movevment of the stock inside may be seen. When it becomes necessary to rod-out or clean a twyer, its plug is removed and a bar inserted through a common sight and clean out hole to poke out cinder which may be lodged at the nose `of the twyer. Periodically, the plug has to be removed to clean dust from front of glass. Both rodding out and cleaning glass is done while blast is on the furnace and is attended witha considerable loss of wind and objectionable noise, and some danger from hot dust to the eyes of the operator. Also the central arrangement of the hole, which is necessary to give the right elevation for a peep sight into the furnace, makes it difficult to draw out through it the dust, etc., which accumulates or is forced there by the blast in cleaning the twyer.

According to my invention, the twyer cap is provided with two openings, one,-a large or poking hole disposed near the bottom level of the blow stock, and -the other a small peep hole normally closed by a peep plug and disposed in the upper part of the cap. rlhis would prevent any substantial loss of air during cleanings of the peep glass and would require the larger hole to be opened only at long intervals when the twyers have to be cleaned. As a further improvement on the genera design of my invention and to increase its factor of safety, I have arranged the sight plug with its peep hole eccentric to its axis of rotation so that by turning the plug the hole may be moved out of register withthe hole in the plug seat inthe cap, thereby shutting off the air from the sight glass and permitting it to be removed,cleaned and replaced without loss of air or danger to the operator, after which xthe plug can be restored to operating positio A is passed through a bolt. hole in the side ex- 'My invention further comprisesthe novel details of construction and arrangements of parts which are hereinafter more particularly described, but only in their preferred embodiment which may be materially al- 60 tered within the scope of my invention.

I have illustrated one embodiment of my mvention inthe accompanying drawings, in Which:

Figure 1 is a plan view of the twyer cap in closed position on its seat. Fig. 2 is a front elevation of 'Fig.,1. Fig. 3 is a vertical sectional view taken l011 the liney --m of Fig. 2.

'In the illustration of my invention 1 have omitted as unnecessary any parts 4of the furnace bosh and have shown myl improved cap-1 applied to close the outer end of the vpenstock or blowstoc'k 2, which is provided at its outer end with a twyer cap seat 3 of *f5 ordinary construction, having on opposite sides pairs of lugs 4, 4, and 5, 5. Between the lugs 4 I pivot, bymeans of a pin 6, an eyebolt 7, the outer threaded end of which tension 8 ofthe cap and receives a nut 9 Whichconnects the cap to the bolt 7 as a hinge. An eye bolt 10, similar to 7, is pivl oted by a pin 11 between Athe ears 5 and its.

outer threadedend is adapted to swing between the Jaws 12on the cap 1 diametrically opposite to the extensionv 8. A nut 13 is threaded on the outer end of bolt 10 and When it stands between the jaws, can be screwed down to draw .the cap tightly into placeagainst its seat I3. The inner face of the cap 1 has a lraised central annular shoulder 14 ,which fits into the opening in the seat 8 and a machined face 15 which abuts the outer lface of the seat.

r1he twyer cap is .provided with a clean outhole 16 whichextends through the plate near the lower edge of shoulder .14 andv has its outer end enlarged .to form aseat for a stopper 17. This stopper is provided with M0 a shank 18 which is pivotally connectedby a bolt 19 to a h andle 20. The .handle is pivoted at one end between the bifurcations of a stud 21 having a threaded shank which is screwed into a threaded opening tapped 1'05 locked to hold the stopper against its seat and seal the hole 16. The handle is provided with slotted enlargement at its center through which the shank 18 of the stopper 17 passes and is pivotally held therein by a bolt 19. Near the upper end of the cap I provide a sight plug seat 26 which is bored thereinto at a slight angle to the face of the cap plate so that it slopes upwardly and inwardly at a small angle. This seat 26 is threaded except at its inner end. A sight plug 27 has its inner end iianged at 28 andadapted to turn with a smooth air tight joint against the bottom of the seat 26, the plug being held therein by means of a stud 29 which has external screw threads adapted to screw into the seat 26 and which is provided with a smooth center bore which will receive and turn freely about the sight plug 27. The outer enlarged end of the stud 29 is squared to receive a wrench. The outer end of the plug is threaded and adapted to receive a pipe cap 30 which is intended to hold in place over the end of the plug a blue sight glass 31. The cap has a central sight opening 32. A sight hole 33 is bored diagonally from end to endY through the sight plug, its inner end being eccentric to the long axis of the plug. The inner wall of the seat 26 is provided with a sight hole 34, also arranged eccentrieally therein and in position to register with the plug hole 33 when the sight plug has been turned to its operating position. The seat is bored in at an angle corresponding substantially to the angle at which the sight hole 33 is bored in the plug, this arrangement bringing the hole 33 in horizontal alinement with the holes 32 and 34 when in sighting position. The hole 33 thereof will move out of register with the hole 34 which Will then be closed by the inner end of the plug which is turned smooth to serve as a valve and by this means the air pressure is shut 0H' from the plug, thereby permitting the cap 30 to be removed and the glass cleaned or replaced leisurely and without risk to the operator. The arrangement described for bringing the inner end of the sight hole 33 to a point eccentric to the long axis, of the plug -is merely a preferable arrangement and may be varied if desired, the object being to obtain in one position of the sight plug a sight opening through which the stock inside the furnace may be seen, the continuity of which opening may be broken by shifting the plug and shutting oil' the. airpressure from the glass and its retaining means. Any other suitablemeans than that described may be used to plug the clean out hole 16, and its arrangement near the bottom of the blow stock is desirable in that on the removal of the plug for rodding-out the twyers, the blast will carry et ,out with it the cnders and dust and not leave an accumulation below the hole where it tends to accumulate with the present twyer caps.

What I claim as new and desire to secure by Letters Patent, is

1. The combination with a twyer, of an end cap therefor having two holes therein, one hole being a large clean out opening near the lower part of the cap and the other being a small sight opening in the upper part of the cap, a closure for the clean out hole,

vand a sight plug for the sight opening which is independent of the closure for the clean out hole, both said holes giving access to the twyer in the direction of its length, substantially as described.

2. A cap for twyers and like devices having a large clean out hole and a small sight hole above the clean out hole, a stopper for the clean out hole, fastening means for the stopper, a sight plug mounted over the sight hole and having a sight opening therethrough adapted, in a predetermined position of the plug, to register with the sight hole in the twyer cap, means to adjust said sight plug to move its opening out of register with the sight hole in said cap, a glass for the opening in the si'ht plug, and detachable means lto hold said glass in place, substantially as described.

3. In a twyer cap having a clean out hole and a relatively small sight hole, a closure for the clean out hole, a sight plug mounted in front of the sight hole, means to hold said plug adjustable in position over said sight hole, said plug havlng a sight hole therethrough adapted, in one position of the plug, to register with the sight hole in the cap while the plug in other positions serves to close said sight hole in the cap, a sight glass for said plug, and a removable device to hold said glass in position over the sight hole in said plug.

4. In a twyer cap having a large clean out opening in its lower portion, a closure therefor, a relatively small sight hole, a sight plug adjustably mounted over said hole and having a sight openingl therethrough which in one position of the plug registers with the sight hole in the cap, means to hold said plug against the cap so that in other of its positions it will valve off the sight hole in the cap, a sight glass for the sight opening in the plug, and detachable retaining means for said glass, substantially as described.

5. In al twyer cap, a circular internally threaded seat bored in its outer face. said seat having an eccentric sight hole leading through the cap, a sight plug which fits against the inner end of the seat and has a sight opening therethrough, the inner end of which is eccentric to the inner end of thi.- plug and adapted in a predetermined position to register with the sight hole in the tially as described.

cap, a screw stud which turns freely on the plug and is adapted to be screwed into said seat in the cap, a shoulder on the inner end of the plug which is adapted to engage and force the plug against said seat, and means to detachably mount a sight glass on the outer end of the plug, substantially as described. Y

6. A sight plug having afsight opening which extends longitudinally therethrough and opens through the inner end of' the plug at a point eccentric to its longitudinal axis, the inner end of said plug being turned smooth to serve as a valve, and the outer end of said plug having means for the attachment of a glass retaining cap, substan- 7. A sight plug sight opening extending longitudina therethrough andopening throu h theinner end of the plug to one side o its longitudinal center line, the inner end of the plug adjacent to said opening being turned smooth to serve as a valve, and a glass retaining means screwed on the outer endof for twyer caps having said plug and having a central opening alining with the sight opening in the plug.

8. In an apparatus of thecharacter described, in combination, a cylindrical sight plug having a sight opening extending therethrough, which opening, at its inner end, is eccentric to the long axis of the plug, a shoulder at the inner end of said plulg,

stud adapted to slip over the outer en shoulder on the plug, a detachable the plug with a slip fit and to engage said lass retaining cap for the outer end of le plug having a sight hole therethrough which alines with the sight opening in said plug.

9 In an apparatus of the character described, in combination, a twyer cap, a seat bored in its outer face at a slight angle, in-

ternal threads in the outer end of said seat, sald cap havin a sight hole leadin eccentrically throug said seat, a sight p ug, the

inner end of' which is shouldered and ts rotatably against the bottom of said seat so as to valve off said sight hole in certain po-4 sitions, an externally threaded stud mounted to turn on said plug and adapted to engage the inner shouldered end of the plug, said stud, when screwed into said threaded Seat, being adapted to force the plug against the bottom of said seat, a sight opening extending diagonally through the plug and adapted in one position to register with the sight hole in the cap, a sight glass over the outer end of said sight opening in the plug, and a screw cap having a sight opening in its-end allid adapted to hold said sight glass on the In testimony whereof l aiix my signature in presence of two witnesses. 

